After creating a new account, I experienced the following behavior with the reseller CP...

For the purposes of this explanation, let's say the new account created was 4075551212...

After successfully creating the new account, I navigated to another account by clicking on 'Accounts' and then a hot-linked 'username'. The selected username account details appeared to show correctly, however at the top of the screen (under the navigation menu), the following information was displayed:
Account Successfully Created
Number Ordered: 4075551212
Account Username: 4075551212

Clicking on the 'Account' tab and a different username continued to show account details for the appropriate account, however the "Account Successfully Created" information continued to show on every navigation to the account details screen until navigating to a tab such as Billing, and then navigating back to accounts again.